The most ambitious mission yet in the billionaire space race saw Jared Isaacman become the first non-professional astronaut to walk in space on Thursday, in partnership with Elon Musk's SpaceX. The Polaris Dawn mission has been welcomed by the aerospace community for pushing the boundaries of 21st-century spaceflight, but dismissed by some in the general public as just another vanity project for the rich. On this week's Tech 24, we discuss what the mission has achieved, and its lofty hopes for the future.